Tree preservation zone

There is a problem

1000 entries with tree-preservation-order field must match the reference field in the tree preservation order dataset

reference: ZZZZDVESXE502
name: The Amersham Rural District Council (Corkers Wood, Penn) Tree Preservation Order No 3 -1970 Confirme
tree-preservation-order: undefined
TPO/1970/003
tree-preservation-zone-type
geometry: MULTIPOLYGON (((-0.670074 51.624499,-0.670152 51.624544,-0.670174 51.624609,-0.670251 51.624679,-0.670266 51.624719,-0.670364 51.624780,-0.670538 51.624755,-0.670892 51.624670,-0.671148 51.624641,-0.671248 51.624622,-0.671401 51.624551,-0.671597 51.624436,-0.671791 51.624294,-0.671918 51.624189,-0.672035 51.624074,-0.672230 51.623979,-0.672227 51.623961,-0.672248 51.623901,-0.672257 51.623825,-0.672183 51.623705,-0.671960 51.623407,-0.671922 51.623335,-0.671907 51.623265,-0.671924 51.623078,-0.671773 51.622986,-0.671536 51.622889,-0.671349 51.622825,-0.670930 51.622711,-0.670549 51.622591,-0.670104 51.622501,-0.669874 51.622434,-0.669730 51.622402,-0.667694 51.622605,-0.668312 51.623799,-0.668326 51.623856,-0.668404 51.623861,-0.668516 51.623842,-0.668655 51.623794,-0.669459 51.623648,-0.669566 51.623830,-0.669698 51.623997,-0.669796 51.624166,-0.669917 51.624438,-0.669955 51.624483,-0.670018 51.624498,-0.670074 51.624499)))
point: POINT (-0.670135 51.623447)
notes
organisation
entry-date: 2010-02-18
start-date: 2010-02-18
end-date

Your dataset is missing the tree-preservation-order column.

The Tree preservation zone guidance explains how to fix the issue:

The reference for the tree preservation order that covers this zone.